Cable tool jar



Jan. 10, 1939.- F. D. HOBBS CABLE TOOL JAR Filed March 23, 1957 2: M1 mg ii 1555mm? 19 7" Ton/max Patented .In 1o, 1939 I 2 143 349.

UNITED STATES PATENT oer-ice CABLE TOOL JAB Frank D. Hobbs, Huntington Park, can, assignor to Sol Core Barrel (30., Compton, Calif., a partnership composed of Art S01 and Lewis A. Larson Application March 23, 1937, Serial No. 132,534

4 Claims. (01. 255-27) This invention relates to a cable tool jar, parwhich is run in conjunction with the jar. A ticularly applicable to oil field use and consists shoulder H, on the upper end of the jar is enprimarily of a jar which is run on a cable and in gaged by the nut and limits the downward conjunction with certain tools or appliances used movement of the nut and sleeve 4. The releasable in the drilling or prod'uctiop'of oil wells. engagin m ans p s s a plurality f An object of my invention is to provide a novel spr fingers l3 w c are tta hed to e lower cable tool jar, which is adapted to run in .conend of the sub 3 and are adapted to g p the head junction with various drilling and production tools of the P as Shown in Figure ach fi er without interfering with the operation of said P ov d d with an inwardly extending shoulder tools. [4 on the bottom thereof, for the purpose of grip- 10 Another object is to provide a novel cable tool P the head of the P An upward p on jar of the character stated, which is simple in the cable tool will cause the fingers 3 t Spring construction and eifective in operation. outwardly, t us releasing the p 3 and permitting Still another object is to provide a novel means t e Sleeve 4 a Hut 5 to move p y until 7 of varying the tension under which the tool is t nut s k s t h ad thus aus n a jar or 15 placed prior to its release to strike a blow. impact the joint 9 for the P p of sen Still another object is to provide a novel cable the o l t ed t aid join Th m unt of tool jar which is adapted to be repeatedly set and P necessary ea the fi s I3 s V r ed released for impact without requiring the withy means e Ting Which encircles t e fi ge s drawal of the tool from the well. and by moving this ring downwardly, a succes- Other objects, advantages and features or insively grea p wi be r quir d t release the vention may appear from the accompanying fingers from the pin 8. A bolt I6 is revolvably drawing, the subjoined detailed description and mounted in the t l5 d is threaded ou the appended claims. the sub 3. Thus it will be evident that by rotat- In the drawing: I ing the bolt IS, the ring I5 will be moved up or 25 Figure 1 is a partial longitudinal sectional view down to provide the proper amount of pull in the of the jar in telescoped position. cable before the fingers release the pin 8. The Figure 2 is a view similar to Figure 1, showgreater the pull on the cable 2, before the fingers ing the parts in extended position. l3' release the pin 8, the greater willbe the blow Figure 3 is a fragmentary longitudinal sectional of the nut 5 against the head 1. A modified form 30 view of the upper part of the jar, showing the offinger tensioning means is shown in Figures 4 gripping fingers. 1 and 5. The ring l'l through which the fingers l3 Figure 4 is a fragmentary and partial longiextend, is provided with a plurality of lugs I8, tudinal sectional view of the jar showing a modieach of which extends through a' longitudinal fledform of finger adjusting means. slot [9, in the outer sleeve 20. The sleeve is 35 Figure 5 is a sectional view taken on line 55 threaded as shown at 2| and upper and lower nuts of Figure 22 and 23 screw onto the sleeve and engage the R f r m par ularly o t d aw n lugs l8, thus enabling the ring 11 to be adjusted numeral 1 indicates a. rope or cable socket to l n itudinally on the fingers. 40 which the cable 2 is attached in the usual and Having described my. invention, I claim: 40

' well known manner. The socket 1 screws onto 1. A cable tool jar comprising a cable socket, a the Sub 3 a d pe therefromnimpact nut sleeve depending from the socket, an impact nut 5 screws onto the lower end of the sleeve 4 and on the lower end of the sleeve, a mandrel extendthe purpose of this impact nut will be further deing through the nut and into the sleeve, coupling scribed. A mandrel-6 extends into the sleeve 4, means on the lower end of the mandrel, attach- 45 through the nut 5. A head I is preferably inable to a tool, a head on the upper .end of the tegrally formed on the upper-end of .the mandrel mandrel against which said nut is adapted to 6. A pin 8 rises from the head 1 and is prefstrike,aplurality of spring fingers mounted witherably integral with the head. This pin is 'rein the sleeve and adapted to engage said pin, said leasalily engaged by a gripping means which will fingers being releasable from the pin upon an 50 be further described. On thelower end of the upward pull being exerted on the sleeve, and m'andrelli, I provide a joint 9, which is held tension adjusting means engaging the spring finflxedly attached to the mandrel or is integral gers whereby a variable pull is exerted to release therewith. The threaded pin It) on the lower end the fingers from the pin.

65 of the joint, screws into the tool (not shown). 2. A cable tool Jar comprimnga cable socxet, a

sleeve depending from the socket, an impact nut on the lower end of the sleeve, a mandrel extending through the nut and into the sleeve, coupling means on the lower end of the'mandrel, attachable to a tool, a head on the upper end of the mandrel against which said nut is adapted to strike, a plurality of spring fingers mounted within the sleeve and adapted to engage said pin, said fingers being releasable from the pin upon an upward pull being exerted on the sleeve, a ring encircling the fingers and slidable thereon and adjusting means engaging the ring whereby said ring is moved longitudinally of the fingers.

3. A cable tool jar comprising a cable socket, a sleeve depending from the socket, an impact nut on the lower end of the sleeve, a mandrel extending through the nut and into the sleeve, coupling means on the lower end of the mandrel, attachable to a tool, a head on the upper end of the mandrel against which said nut is adapted to strike, a plurality of spring fingers mounted within the sleeve and adapted to engage said pin, said fingers being releasable from the pin upon coupling means on the lower end of the mandrel,

attachable to a tool, a head on the upper end of the mandrel against which said nut is adapted to strike, a plurality of spring fingers mounted within the sleeve and adapted to engage said pin,

said fingers being releasable from the pin upon an upward pull being exerted on the sleeve, a ring slidably mounted on the fingers, said sleeve having a plurality of slots cut therein, lugs on the ring projecting through each of the slots and adjusting nuts screwing on the sleeve against the lugs whereby said ring is adjusted longitudinally of the fingers.

FRANK D. HOBBS. 

